USB inverter



FIG. 1 is a perspective view of the USB inverter;

FIG. 2 is a top view of the USB inverter;

FIG. 3 is a bottom view of the USB inverter;

FIG. 4 is a right view of the USB inverter;

FIG. 5 is a left view of the USB inverter;

FIG. 6 is a front view of the USB inverter; and,

FIG. 7 is a back view of the USB inverter. 

The ornamental design for a USB inverter, as shown and described. 